The Rainbooms, also known as the Sonic Rainbooms,[1] the Equestria Girls,[2] and the Crystal Rainbooms,[3] are a student band in the My Little Pony Equestria Girls franchise, consisting of its main characters.

When the Dazzlings arrive at Canterlot High and place everyone under their spell, the Rainbooms, unaffected by the Dazzlings' magic, call on Twilight Sparkle for help and temporarily recruit her into the band as the new lead vocalist.

As they advance through the competition, the Rainbooms succumb to moments of infighting: Rainbow Dash's egotism grates on her friends' nerves, Applejack argues with Rarity over the latter's obsession with the band's stage wardrobe, and Fluttershy's desire to play a song she wrote goes unheard. Other bands in the competition also attempt to sabotage their performances, and Trixie—at the suggestion of the Dazzlings—traps the Rainbooms under a stage to keep them from participating in the final round.

Before the friends fall victim to the Dazzlings' magic due to their arguing, Sunset Shimmer convinces them to work out their disagreements. With the help of Spike, DJ Pon-3, and later Sunset herself, the Rainbooms eventually defeat the Dazzlings in the final round of the Battle of the Bands and free the school from their spell. Soon after, Sunset Shimmer is welcomed into the Rainbooms as a new member.

The Rainbow Rocks animated prequel shorts partially depict the band's formation, with each member discovering and taking up what would be their instrument of choice.

In Guitar Centered, Rainbow Dash acquires a new electric guitar after a "shred off" against Trixie Lulamoon. In Hamstocalypse Now, Fluttershy discovers her talent for the tambourine when tending to a rambunctious group of hamsters. In Pinkie on the One, Pinkie Pie discovers her talent for playing the drums when her friends seek an outlet for her boundless energy. In Player Piano, Rarity takes up the keytar as a more portable substitute for the grand piano. In A Case for the Bass, Applejack recovers her bass guitar from Flim and Flam after Granny Smith accidentally sells it to them at a yard sale.

In A Fine Line, the Rainbooms have an informal rehearsal while waiting in line for the Tirek's Revenge video game at the Canterlot Mall. In Road Trippin, Granny Smith drives the Rainbooms' tour bus to their scheduled performance at Goldie Delicious' party.

In Rollercoaster of Friendship, the Rainbooms get booked as the centerpiece for the new Equestria Land theme park's light parade. When the park's public relations head Vignette Valencia attempts to unilaterally change the group's image, she uses her Equestrian magic-enchanted cell phone to teleport the members to cyberspace. She proceeds to replace them with dramatically-altered holograms to perform at the parade with herself as the lead singer, renaming the band "The Throwbacks". After the members escape and destroy Vignette's phone, the band performs Photo Booth as the parade's headliner.